Method of manufacturing porcelain insulators.



UNITED STATES PATENT OFFICE.

WILHELM BOEHM, OF GHARLOTTENBURG, GERMANY.

METHOD OF MANUFACTURING PORCELAIN INSULATORS,

No Drawing.

To all whom it. may concern Be it known that I, VVILHELM BOEHM, asubject of the German Emperor, residing at 39 Mommsenstrasse,Charlottenburg, Germany, have invented certain new and usefulImprovements in Methods of Manufacturing Porcelain Insulators, of whichthe following is a specification.

This invention relates to an improved method of manufacturing porcelainelectric insulators and has for its object to provide means bv whichsuch insulators, which are adapted for use with high tension conductors,may be more cheaply manufactured than has been possible with the methodsheretofore followed.

According to the invention, the body of an insulator formed of unglazedporcelain, which is sufliciently porous, is treated with a highlyinsulating material. For this purpose heavy hydrocarbon, such asparaflin or compounds like india rubber, oils and the like may beemployed, and, after the pores of the body have been filled with suchinsu lating material, the latter is treated so that it is renderedstable and caused to constitute a permanent part of the article. Toapply such insulating material the body may be suitably heated and thentreated with the insulating liquid while in a vacuum, or by means ofsuitable pressure said liquid may be forced throughout the pores of thebody. If desired, powdered material of high insulating character, suchas mica, may be incorporated with the liquid, which will serve as abinder.

In case the filling material for the pores com rises an oxidizable oil,the article is pre erably treated with ozone which acts to oxidize theoil and render the filling of the pores stable. That is, when aninsulator formed as described and saturated with oil is exposed to theaction of ozone the oil is readily oxidized so that a solid body of highinsulating capacity is provided.

If desired, the initial body may be molded from relatively small piecesof orcelain material, such as crushed porcelain waste, which are heldtogether by amaterial or substance which, during the subsequent fir-Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed February 24, 1913. Serial N 0. 750,282.

ing or baking operation, will be evaporated or fritted so that the bodywill have a maximum amount of porosity.

By the method above described, it is possible to produce insulatorsadapted for high potential current work from very inexpensive porcelainmaterial and as such material, owing to its melting point beingrelatively lower than the higher grades of porcelain, does not requirean extreme amount of heat for the baking operation, the cost of thenecessary kilns and means for heating the same is materially reduced.Further, the high percentage of waste arising from cracking or crazingdue to the employment of a high degree of heat is obviated.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent is: I

1. The herein described method of making an electric insulatorcomprising forminga suitable body of porous, unglazed,

porcelain, filling the pores of said body with a fluid insulatingcompound, and treating the article to render the insulating compoundstable.

2. The herein described method of making an electric insulatorcomprising forming a suitable body of porous, unglazed, porcelain,filling the pores of said body with an oxidizable fluid, and exposingthe article to the action of ozone, for the purpose described;

\ 3. The herein described method of making an electric insulatorcomprising forming a suitable body of porous, unglazed, porcelain,filling the pores of said body with a mixture of an oxidizable fluid andpowdered non-electrical conducting material, and treating the article torender the insulating compound stable.

4. The hereindescribed method of making an electric insulator comprisingforming a suitable body of porous, unglazed,

- porcelain, filling the pores of said body with a mixture of anoxidizable oil and powdered non electrical conducting material, andtreating the article with ozone.

5. The herein described method of making an electric insulatorcomprising molding a suitable body of relatively small particles ofporcelain body, the pores of which are 10 porcelain material and abinding medium filled by a stable insulating compound. adapted to befritted duringthe subsequent In testimony whereof I have affixed myfiring operation to give the body a maxisignature, in presence of twowitnesses.

mum porosity firing the article filling the pores of the ,body with afluid insulating WILHELM BOEHM' compound, and treating the article toren- Witnesses:

der the insulating compound stable. HENRY HAsPER,

6. An electric insulator comprising a VVOLDEMAR HAUPT.

